STEIN, Erwin. Milestones of Direct Variational Calculus and its Analysis from the 17th Century until today and beyond – Mathematics meets Mechanics – with restriction to linear elasticity. Computer Assisted Methods in Engineering and Science, [S. l.], v. 19, n. 1, p. 7–91, 2017. Disponível em: https://cames3.ippt.pan.pl/index.php/cames/article/view/100. Acesso em: 12 jan. 2025.